计算练习一1. 直接写出得数378+ 199= 12×5= 23 +34 = 910 ÷13 =512 ×47 +107×512 =4+54 = 9.97+0.3= 5-117-37 = 1÷35 ×5= 1.25×3× 8=2.计算χ -49 χ =1027 300-288÷12× 5 815 ×[(34 -12 ) ÷35 ] 计算练习二1. 直接写出得数488- 199= 4.8÷12= 4.45+7.6 +2.55 =58 -14 =34 ÷12 = 1-59 +49 =310 ×56 =712 ×34 +54 ×712 =2.计算34 ︰χ =38 ︰23712 ÷9+19 ×512910 ÷[12 ×(65 -710 )] 计算练习三1. 直接写出得数24×5= 0.36÷12= 1÷25 ×5= (23 +14 ) × 12=23 +12 =578- 299 =23 ÷118 = 1.25×11×8=45 × 10=34 -58 =2.计算x ∶42=57 ∶10 430―3684÷12+93 310 ×[(34 -23 ) ÷14 ] 计算练习四1. 直接写出得数3.6 ÷ 12= 860-298= 8-37 -47 = 2.5×1.2 = 1÷0.5 ×2=2.5 - 1.65 = (13 +25 ) ×15=35 ×15=14 ÷12 = 2.5×17×0.4 =2.计算χ +35 χ = 16 6. 5×(2.4 -1. 6)-1.2 215 ÷[25 -( 1-710 )] 计算练习五1. 直接写出得数1.25 ÷0.5 =23 ×12= 1-511 +611 = 25×4= 2÷1%= 0.23= 4―14 = 910 ÷13 = 560÷5÷8= 348+199= 2.计算0.3χ=67 4260÷ 15-12×4.25 [1112 -(25 +512 )] ÷12计算练习六1. 直接写出得数15×8= 576―299= 0.22= 12×(13 +14 )= 1.25×32×2.5 = 89 ―56 = 78 ―25 +78 ―25 = 4.45― 1.75 ―1.45= 7÷ 1.4= 35 ×15= 2.计算χ -59 χ = 20 29 +79 ×37 ÷32910 ÷12 ×[(65 ―310 )]计算练习七1. 直接写出得数15×6= 360÷ 1.2= 12÷(13 +14 )= 0.32= 78 ×25 ÷78 ×25 = 45×0.99= 4.45―1.75 ―1.25= 2×10%= 1―35 +25 = 5÷35 ×53 = 2.计算χ ×( 34+ 23)= 724 7.5-( 3.28 +2.15 ) 2-( 16 +23 ) ÷59计算练习八1. 直接写出得数0.3 + 19×0.3 = 44×2.5 = 24×4= 3.6÷0.12= 7÷78 ―78 ÷7= 389-298= 1―35 ―25 = 5×35 ÷53 = 0.42= 560÷16÷5= 2.计算 4 χ ÷13 =4 3684÷12+43 15÷ [( 23+ 15)× 113]